Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the beginning of the period	$ 21,672	$ 19,112	$ 22,021	$ 18,996
Balance at the end of the period	22,271	19,476	22,271	19,476
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the beginning of the period	(16,780)	(22,532)	(16,740)	(23,234)
Other comprehensive income before reclassifications			167	366
Amount reclassified from accumulated other comprehensive income			74	699
Other comprehensive income/(loss)	280	363	241	1,066
Balance at the end of the period	(16,499)	(22,169)	(16,499)	(22,169)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the beginning of the period			(135)	(18)
Other comprehensive income before reclassifications	130	147	107	191
Amount reclassified from accumulated other comprehensive income			(112)	14
Other comprehensive income/(loss)	109	161	(4)	205
Balance at the end of the period	(139)	187	(139)	187
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the beginning of the period			(3,591)	(3,362)
Other comprehensive income before reclassifications			52	172
Other comprehensive income/(loss)	82	(134)	52	172
Balance at the end of the period	(3,539)	(3,189)	(3,539)	(3,189)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the beginning of the period			(13,013)	(19,854)
Other comprehensive income before reclassifications			9	3
Amount reclassified from accumulated other comprehensive income			185	686
Other comprehensive income/(loss)	102	336	194	689
Balance at the end of the period	(12,819)	(19,165)	(12,819)	(19,165)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the beginning of the period			(1)	(1)
Other comprehensive income before reclassifications	(12)	0	(1)	0
Other comprehensive income/(loss)	(12)	0	(1)	0
Balance at the end of the period	$ (2)	$ (1)	$ (2)	$ (1)